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Nano20211
Asked: 2021-12-09 13:31:10 +0800 CST 2021-12-09 13:31:10 +0800 CST

How can I validate the number of minimum numbers in an Array?

  • 772

This function returns the highest and lowest number of all those entered, so I want to validate that the user does or does enter two numbers, but I can't get it

let arr = [-1, 5, 14, 0, 6];

const elevarNumeros = (arr = undefined) => {
    if (arr === undefined) return alert("Debes ingresar los numeros");
    if (!(arr instanceof Array)) return alert(`${arr} no es un número`);
    // Puse el if que sigue para tratar de validar pero no funciona
    if (length.arr < 1) return alert("Debes ingresar dos numeros o más");

    for (let num of arr) {
        if (typeof num !== "number") return alert(`${arr} no es un número`);
    }

    console.log(`El numero mas alto es el ${Math.max(...arr)} y el mas bajo ${Math.min(...arr)}`)
}

elevarNumeros(arr);
javascript

3 Answers

  1. The error is in the third ifone because you are accessing the size of the array incorrectly and it would be validated that it has more than 1 element.

     if (arr.length < 2) return alert("Debes ingresar dos numeros o más");

    The complete code would be:

    let arr = [-1];

const elevarNumeros = (arr = undefined) => {
    if (arr === undefined) return alert("Debes ingresar los numeros");
    if (!(arr instanceof Array)) return alert(`${arr} no es un número`);
    // Valida si existe menos 2 de elementos
    if (arr.length < 2) return alert("Debes ingresar dos numeros o más");

    for (let num of arr) {
        if (typeof num !== "number") return alert(`${arr} no es un número`);
    }

    console.log(`El numero mas alto es el ${Math.max(...arr)} y el mas bajo ${Math.min(...arr)}`)
}

elevarNumeros(arr);

    • 0

  2. try this code

    if (arr.length >= 1) return alert("Debes ingresar dos numeros o más");

    the length tag comes after your variable enter the code here

    • 0
  3. Best Answer

    You already have the answer to your problem from As they comment it is an error in the Syntax . I wanted to leave you an addition regarding possible errors with different types of specific data that the user could insert. See. @nashvent



    • undefined
    • boolean
    • symbol
    • infinity

    let arr = [1, 2, 3, 4, -5]
const elevarNumeros = (arr = undefined) => {
    
    
    if (!(arr instanceof Array)) return alert(`${arr} No es un Array, es un ${(typeof arr)}.`);
 
    if (arr.length < 2) return alert("Debes ingresar dos numeros o más");

    for (let num of arr) {
        if (typeof num === "string") return alert(`${arr} no es un número`);
        // Si queires el "Infinity" puedes retirar la condicion para ello.
        if (typeof num !== 'number' || isNaN(num) || !isFinite(num)) return alert("Debes ingresar los numeros");
    }

    console.log(`El numero mas alto es el ${Math.max(...arr)} y el mas bajo ${Math.min(...arr)}`)
}

elevarNumeros(arr)

    • 0